Electric burglar or automatic fire alarm



2 Sheets-Sheet 1.

(No Model.)

. E. R. WILDER. ELECTRIC BURGLAR 0R AUTOMATIC FIRE ALARM.

Patented Sept. 9. 1890.

amoewtoz lznunifi M114, T attomw I V l n l- V 22:: H l A V l I e WW UNITED STATES- PATENT OFFICE.

EDMUND B. WILDER, OF KANSAS CITY, MISSOURI.

ELECTRICBURGLAR OR AUTOMATIC FIRE ALARM.

SPECIFICATION forming part of Letters Patent No. 436,030, dated September 9, 1890.

Application filed November 29, 1889. Serial No. 331,865. (No model.)

To all whom it may concern.-

Be it known that I, EDMUND R. WILDER, of

Kansas City, Jackson county, Missouri, have invented certain new and useful Improvements in Electric Burglar or Automatic Fire Alarms, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings,forming a part hereof. 7

My invention relates to certain improvements in electrical burglar-alarms; and it consists in the construction,arrangements, and the combination of the parts of which it is composed,as will be hereinafter more fully described and claimed.

Referring to the accompanying drawings, in which corresponding parts are designated by similar letters and figures, Figure 1 is a plan view of my invention. Fig. 2 is a side elevation thereof. Fig. 3 is a detail top view of the safety-magnet. Fig. 4 is a detail side view thereof. Fig. 5 is a detail perspective view of the alarm-wheel with parts contiguous thereto, taken from below. Fig. 6 is a side view thereof. Fig. 7 is a diagrammatic representation of the circuits which are used in my invention.

Upon a suitable base-board Bis mounted a train of clock-work D, which is driven bya spring contained within the drum 0 and regulated by the escapement f. Upon the central shaft E of this train of clock-work and above the upper plate A of its supporting-frame is secured the non-conducting alarm-wheel E which has a series of teethe upon its periphcry and a smooth portion 6. The movement of this wheel E is regulated by the forks h and h upon the pivoted lever H, the movement of which is in turn regulated by the magnet P and its antagonistic coil-spring Z.

In order to form the necessary connection between the wheel E and the lover H,whereby the former will be regulated, two pins G and G are secured in the Wheel E upon different radii thereof, the pin G projecting from lower pin G of the'wheel, and that upon a passage of a current of electricity through the coil of the electro-magnet P, located be neath the lever H, the latter will be drawn down, together with the armature 19, secured I thereto, andwill be held in this position as .long as the current passes through the coil,

and will while thus held down cause the up per fork h thereon to obstruct the upperpin' G, and thus stop the wheel before it has completed a full revolution. Upon the current ceasing the lever H will be thrown up by the action of the sprin'gl, and its upper fork releasing the upper pin G, the wheel will rotate until its lower pin G engages the lower fork "h'.

The pins G and G are so arranged upon the wheel in relationto the smooth portionc" of its periphery that the wheel will be in a position for the pins G and G to be engaged 'by the forks h and h when the ends of the pens r r bear upon such -smooth portion. These pens r r consist of spring-pieces secured to an insulating-base R and lie' upon both sides of the arm 8, which carries contactpoints s. It will be noticed that by this construction if the end of the pen 1" bear upon the smooth portion of the periphery of the wheel E or upon the point of the teeth e a make contact'with the adjustable contactpoints, which is connected to one pole of the local circuit, the said armature being connected to the opposite pole thereof, as will be described.

In order to regulate the movements of the lever H, I use a set-screw 2', carried in a bracket I.

The circuits used by me are as follows: The main line 1 1 is run from the central station W, which is provided with any suitable form of annunciator 2, to the building V to be protected, in which building the line 1 is looped through the windowsand doors thereof and including the house-battery 3,.pa'ssed around the safety-magnets T, andis connected to the pen 0", the arm 8 being connected to the line 1, while the pen 1' is connected to the ground. It will thus be seen that under ordinary conditions the circuit will be constantly closed between the Pen 0* and. the arm 5, whereby the corresponding indications will be given at the central station.

In order to cause the raising of a window, 850., to release the wheel E, a local circuit 4 is provided, in which circuit is placed the magnet P and the local battery 4, one of the poles of which latter is connected to the wire 5, which is also looped through the windows and doors of the house, and is adapted to 7 make a contact with the line 1 upon a disturbance thereof. The opposite pole of the local battery 4 is connected with the coils of be seen that if a contact is made at any window J between the main line 1 and the wire 5 the local circuit will be completed through the said J and 0, whereby the magnet P will be energized and will draw down the lever H, releasing wheel E, as described. The movement of this wheel will cause the main circuit to be made and broken between the pen 7' and the arm 8, causing corresponding current to pass over the main line and to be received at the central station. It will also be noticed that if the main line be broken and grounded between the central station and the house to be protected a circuit could be completed between the ground end of the said wire and the pen 'I through the ground-wire 9 and the earth. This entire circuit would be so completed in such a case upon the revolution of the wheel E when the end of the spring 1* falls into the notches between the teeth 6 thereof and makes a connection with the arm s,'whereby the alarm will be sent in.

In order to notify the central station in case it is attempted to short-circuit the lines 1 1 outside the building, as indicated at S, dotted lines, the house-battery 3 is made of such strength as to attract the armature n of .the magnet T upon such a circuit being formed, in which case the armature will be drawn, making contact with the point 8', closing the local circuit through the magnet P, and thus releasing the wheel E, as has been heretofore described, whereby an alarm will be sent to the central station, as has been already made known.

It will be evident that several houses may be looped on one main wire, and that the teeth 8 on the wheel E may be so arranged as to send in a distinctive signal for each house.

I am aware of the invention disclosed in Patent No. 186,887, granted January 30, 1877, to Selden, and I do not desire to claim the construction shown therein.

Having thus described my inventiomwhat I desire to secure by Letters Patent, is

1. The combination, with a revolving toothwheel, of two pens bearing upon the said wheel, one of the said pens being connected with one of the leads of the main circuits and the other with the ground, and an arm connected with the other lead of the main circuit and having contacts thereon contacting with said pens, as described.

2. The combination, with a revolving wheel, of two pens bearing thereon, each of the said pens consisting of a piece of spring metal, and

an arm havin contact-points thereon conof the said pens,

tactin g alternately with each as described.

3. The combination, in a burglar-alarm, of

a main circuit, a safety-magnet and a battery included in the said main circuit in the 10- cality to be protected, the said battery being of such a strength as not to attract the armature of the said magnet under normal conditions, but being of a sufficient strength to attract the said armature upon the said main line being shortcircuited, a local circuit located within the area to be protected, mechanism included in the said local circuit and controlling an alarm at a central station, and a contact-maker for the said local circuit consisting of the armature of the said safetymagnet, as described.

4. The combination, in a burglar-alarm, of a main circuit, a safety-magnet and a battery included in the said main circuit in the locality to be protected, the said battery being of such a strength as not to attract the armature of the said magnet under normal conditions, but being of sufficient strength to attract the said armatureupon the said main line being short-circuited, a local circuit located within the area to be protected, a revolving wheel,

mechanism for governing the movement of the said wheel actuated by the current of the local circuit, a contact-maker for the said local circuit consisting of the armature of the said safety-magnet, and a contact-maker included in the main circuit and actuated bythe movement of the said wheel, as described.

5. The combination, in a burglar-alarm,of a main circuit, a safety-magnet anda battery included in the said main circuit in the locality to be protected, the said battery being of such a strength as not to attract the armature of the said magnet under normal condition, but being of sufficient strength to attract the said armature upon the said main line being short-circuited, a local circuit located within the area to be protected and consisting of two branches, a revolving wheel, mechanism for governing the movement of the said wheel actuated by the current of the local circuit, a contact-maker for each of the said branches of the local circuit, one of the said contact- .makers consisting of the armature of the said in the main circuit and actuated by'the movement of the said wheel, as described.

6. The combination, in a burglar-alarm, of a main circuit, a safety-magnet and a battery included in the said main circuit in the 1ocality to be protected, the said battery being of such a strength as not to attract the armature of the said magnet under normal condition, but being of sufficient strength to attract the said armature upon the said main line being short-oircuited, a local circuit located Within the area to be protected and consisting of two branches, a revolving wheel, mechanism for governing the movement of the said wheel actuated by the current of the local circuit, a contact-maker for each of the said branches of the local circuit, one of the said contactmakers consisting of thearmature of the said safety-magnet and the other consisting of a maker actuated upon by the opening of the 20 door, window, 850., two pens bearing upon the said wheel, and an arm having contact-points thereon contacting alternately with the said pens, one of the said pens being connected with the ground and the remaining pen and 2 5 the said arm being connected to the opposite leads of the main circuit, as described.

In testimony whereof I aflix my signature in presence of two witnesses.

EDMUND R. -WILDER. Witnesses:

J. W. FRIEELEY, J. 0. SMITH. 

